Tightening device.



, a. F. MILLER. 'HGHTENING DEVICE.

APPLICATION FILED 0CT.26. 19!].

1,280,800. Patented Oct. 8, 1918. 5% Z ATTORNEY HARRY F. MILLER, OF BRIDGEPORT, CONNECTICUT.

TIGHTENING DEVICE.

Specification of Letters Patent.

Patented Oct. 8, 1918.

Application filed October 26, 1917. Serial No. 198,719.

To all whom it may concern:

Be it known that I, HARRY F. MILLER, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Tightening Devices, of which the following is a specification.

This invention has for its object to provide a tightening device adapted for general use and especially adapted for use in tightening wires used in securing the lagging and cleats of forms in concrete construction, the essential requirements being an inexpensive and easily operated tightening device which may be used many times, thereby appreciably reducing the cost of concrete construction.

With these and other objects in view, I have devised the novel tightening device, the construction and use of which I will now describe referring to the accompanying drawing forming a part of this specification and using reference characters to indicate the several parts.

Figure 1 is a plan view of a portion of the form for a concrete wall, illustrating .the use of my novel tightening device,

Fig. 2 a side elevation correspondingtherewith,

Fig. 3 "an elevation partly in section, on an enlarged scale of the body and nut of my novel tightening device, and

Fig. 4 a perspective view of the head detached.

My novel tightening device comprises a tubular body 10 having an external screw thread 11, extending one-half more or less of its length, a bearing nut 13, adapted to engage the thread on the body, and a head 14: consisting of a hub 15 adapted to engage the ends of the body opposite to the bearing nut, and a bearing plate 16, over which the end of the wire pass and are twisted together, and which is shown as provided in its outer face with grooves 17 which receive the wire.

In building side walls in concrete construction, the forms consist of sections, each section made up of boards, commonly spoken of as lagging, and indicated by 18, secured together by cleats 19, the sides of the form being spaced apart by spreaders 20, see

Fig. 1. In building columns, the sections of lagging secured together by cleats are ordinarily placed vertically, not shown.

My novel tightening device is adapted to be used in connection with wires, indicated by 26, tosecure the sections of lagging in place. The sections and spreaders are placed in position, as indicated in the drawing. The wire is'passed through holes in the lagging on opposite sides of the cleats, the tightener, with the head in place, is placed in position with the face of the nut against one of the cleats and the wire inclosing the opposite cleat, then the ends of the wire are brought over the head of the tightener and twisted together, and then the nut is rotated on the body to force the body outward and strain the wire tightly over a cleat and the head of the tightening device, as clearly shown in Figs. 1 and 2.

Having thus described my invention, I claim:

1. A tightener for wires in concrete form constructions, comprising a body threaded at one end, a rotatable bearing nut engaging the threaded end of the body and adapted to bear against the form construction, and a headhaving means for engaging with the other end of the body, and grooved to receive the wires.

2. A tightener for wires in concrete construction comprising a tubular body threaded at one end, a rotatable bearing nut engag ing the threaded end of the body and adapted to bear against the form construction, and a head having a hub fitting within the other end of the body, said head being grooved to receive the wires.

3. A. tightener for wires in concrete constructions comprising a tubular body externally threaded at one end, a plate-like head grooved to receive the wires and having a hub engaging the other end of said body, and a, bearing nut engaging the threaded end of the body and adapted to bear against the form construction, said nut having a bearing surface and an angular wrench engaging portion.

In testimony whereof I afiix my signature.

HARRY F. MILLER.

copies of this patent may be obtained for five cents each, by addressing the Commissioner or I'atents, Washington, D. O. 

